Crankcase scavenger



Aug 20 394@ c, Q RANDALL ZAME CRNKQASE SCAVENGER Filed Sept'. 19,A 1945 3 Sheets-Sheet 41 l, sNvEN-roR ma MALL ATTORNEY c. c. RANDALL,

GRANKCASE SCAVENGER Aug...20, 1946.

Filed sept. 19, 1945 s shams-sheetA 2 iNvENToR ug 20% 39436 fc. n RANDALL l- 2,406,103 4 CRANKCASE SGAVENGER Filed Sept. 19, 1945 I 3 Sheets-Sheet 5 `Patented Aug. 20, 1946' 2,496,103 CRANKCASE SCAVNGEE Clark C. RandalL'ulOakuPark, Application September 19, 1945.,` Serial No. 617,201

aolaims. (c1. 12s-,17155 .This invention is directed to new and useful improvementsin'crankcase scavenger.

It is ay Wellknown, fact thata serious problem is ever present due to the ,incomplete and .un--

successful elimination from internal combustion automotive engines of vapors, gases, and moisture. produced during the operation of such engines.

Water,. gum, resinous and acid-laden vapors` resulting from combustion enter the crank case Space. as a result of leakage between the pistons and cylinder Walls the volume` of leakage being large or small depending upon the condition of the engine. The result is a serious deteriorating effect on lubricating'oils and the production of harmful deposits and sludge that follows, all of which interferes with the efcient' operation of the engine and shortens the life of; theparts thereof. f. a

.It is recognized that attempts have heretofore been made t0 solve this problem by providing various means to ventilate the engine and crankV case .to remove these harmful gases and vapors but none of these means has proved efficacious for various reasons.

The usual internal combustion automotiv engine is provided with Ventilating or breathing means whereby fresh air is admitted into the crank case and permitted to be exhausted therefrom. Often this is induced by motion of the vehicle that tends to withdraw the air from the crank case. Y This airflow has also been caused bypositive pressure means such as the exhaust, manifold vacuum or engine fan but inv all such cases the pressure has been inadequate to thoroughly svcavenge the fumes and gases and the means for accomplishing the results have been either too cumbersome or have involvedchange in engine design or both and some of the means used have been harmful to engine operation.A

It is the primary object of this inventionl to provide a means for effectively removing` or, scavenging such undesirable gases from the crank casev of an internal combustion engine that is simple in construction and that may be installed on--the conventional types of automotive engines without major interference with the engine de- ,t

sign.

Another object of this invention is to provide a crank case scavenger whereby an adequate air` to accomplish the desired results.- e

And still another object of this invention is to provide an improved crank case scavenger that will .be safe in operation, will not interfere in any way with the normal operation of the engine and may be quickly fitted to and become part of any conventional automobile or truck engine.

A Yfurther object is to provide a unitary structure comprising air scoop and Yaspirating means of simple design that may readily be attached to a conventional automotive engine to operateso as to 'thoroughly scavenge the engine.

The word scavenger has been used sure to in fact removethe undesirable .gasesas Well as ventilate the engine. l

In the drawings: y 1 Fig. 1 is a side elevation View trucks utilizing one form of the invention herein described.

Fig. 2 is a side elevation view of portion of an- Y other conventional form ofsuch an engine on which lis installed a scavenger embodying this invention. Y

Fig. 3 is a side elevation View of a portion-of still another conventional form of engine utilizing this invention by means of a unit-attachment.` 4.

Fig. 4 is a' plan View of the air pressure scoop attachment used as a partof one form ofthe crank case scavenger herein described.

Fig. 5 is a plan View of-a conventional liywheel t cover cut awayto receive air scoop shown in* Fig. 6 is a sectional view taken along line. l-lil of a scavenger embodying the invention herein' described. Y

In detail the engine blockfis indicated by the reference character l, the crank case -2, and the flywheel casing 3. A typical air inlet to the crank 1 v fcase is shown at 4 and the breather outlet at 5.

An aspirator or Venturi attachment Vli is con-v nected with breather outlet 5 by any well known means, such as hose and clamp connection 5a. This attachments is a unit comprising an outlet extension 'I and a larger air pressure conduit v8 lis 4utilized to producethe air pressure necessary herein Y advisedly as distinguished from' vventilator. This distinction is that a ,ventilator` does not cause pressure that will adequately remove the fumes While a scavenger creates adequate pres.

of a conventional internal combustion engine'for automobiles vor v with the usua1 removable @over n that is cut Y Fig. '4. shown at vI3 having teeth I4 for connection with 2 0 let orifice l0. t

, Thus the aspirator attachment 5 provides a Venturi unit to function as hereinafter e'Xlolainedsf.:,`

, `The conventional ywheel casing 3 is-.p1l,Qjlided,15L

away (Fig. 5) as at l2 to 'provideeantfairioutl"fe-.l to the air pressure scoop attachment shown inM The flywheel ofgusual construction is" conventional starten VFI'he-l.iiywheel:casingfisfproe..

vided with the Vusuahebre'atlien :openingsaknotr-.f 1

shownor -an-air opening .mayebe lmadetif-neededt.

Theair scoop.'attachment...Fig` is formedtwith'itf a connecting plate! L5 tourved-tozfitf thefcontourf`25 of the iiywheel-:eoverel I".V E'-It isprovidedfwithlholes? lSwthatwillialignwithholes |1512 fof '-.theoover igt-1.1' whereby it can Aloef secured toethe`- lywheel .casing-1 covera--H inf'anyr welle-known# manner.' Thi's'fiair scoopi'ffatta'chmentspiate vl5 v"is lformedf'zwithf an 30 ellipticalainoutletil'leadingttofconduit :H5 74Thus it i'sf-seenethatv-whenf-theairiscoops A"attached to the flywheel coversthe air foutletf-I-f'willfbe'fadjaf.v cent-theteeth Mlf y-wheel Hi:`1i'Conduit.Lv |'1 v'extendsfforwardly from the-iywheelandfthegoutlete35 end-andthe connection 9i are joinedetogether by'. .f a sectionlfof Fair..vir'iressure conduit =..\|.8 by' 'anyt well-f'I i lnowr-rclainping'ijneansr2 1 Witii'the constructionf-hereinabovedescribed fiti'lfcanbe seen that whenever-thefen-'gine:issinloperafee tion the flywheel will rotate in litho-:direction of move rapidly'lpast outletsflZ fandffl 6 land wifliiact-f 1: as -a `'blo'werato forceeV substantial' amount'- ofea-ir. outwardly through conduit I1. '45

pressurefwilllbe eXertedfinl-theldirectiomof ther." arrows-through'conduits: fi 'I and'.v I 8;fconnectionf9y iT atmosphere-through :orifice l1|-.|Jf. iThisrapid move-fv 50 mentre-of;air"pastoutletiextensionla will'create ay 1' suction@or-=vaeuum-thereintitoI i-rapidlyfwithdrawf fr gasesfirom-fthe-crankfcase tofweffectztheeneeded seafvengingiactionly As thislactionf progresses .fresh air will be drawn-into.fthei'crank'icase .through-154;v

breathet-.inlet A.'Iheffmovementl ofothe.automa--v bile in a. f direc ion from` Vlefti'to. rig-,htfwill-fcauseflip air to pass the angular outlet orifice. I0 to creat anfaddeisuction to' assistin.y .thewithdrawals'oi the crank case fumes. It is to be noted that .thisigo' the=r`outletiis shown-looming' fromzthefi'sidef of @the engine"- block ioutf'irr-fFig-.rzeit?'is v.showin as lo'catedzq;

y on the lower ange of the engine block. The

breather outlet here is indicated by I9 with the usual aspirator or Venturi attachment 6 connected thereto, by connector 20.

In the modification shown in Fig. 3 the .breather outlet 2| is positioned in the side of the engine block I, near the ywheel casing 3. This permits the use of a unitary structure shown in Fig. 7 in whichthe air scoop and .yentur-i-farefformed as a unit. Referring to' Fig. lithg air scoop is indicated generally by reference character 22 and the venturit by 23. The air scoop comprises the same attachment plate 2'4 having outlet air opening 25;:andfconduit 26 leading therefrom. This coniuit .becomes the air pressure receiving conduit of venturi' 23 connecting with outlet conduit 21:.;Whichtasnrroundszfthe outlet ,extension 28 in f the mannerA hereinbefore described. The inlet end 29of^'conduit 28, in this modification is then connected by means of hose and clamps, or any otheriwell yknown `rrneans tocthe'outleirbreathen i.'

This provides a: uni-tary: structureathattioanobe:aV easilyfatta'chedftorfaccomplisir the*tlfi'oroughescav= enging action-whenth'e engine isfin operation-2` Inthemodi/cationtshown.inliugslthefaspiratin .if meansis the`- sameiastshown in but-instead@ of the-t air.: pressure# receiving. l'connect-,ioni2.91 biein'ger joined to an air scoop receiving its pressuretf-roncuf.:

the niiywheel.: it is 'directly/v1.fconnectedbA witlnithe outlet.=3 0 "off a smallblowen f3.| .ithatqisi'mounteduto-sf the sidefof-the enginefblo'ck by. any desiredfbracket means.`l 'BlowerM 3 IP is 'foperatedi by fan :associate eleetric.=motor.l 3'2 'operating'. fromtgthe1electrica circuitfofftheautomobile or truck eng-.inettol Itis-ofcourse more desirableitofutilizeithe wheel/1to1;l the'.` blowing.:.frrieansibut'.` some in stancesY thefseparate-,f:independent blowin "mear-is shown in :Figi-18 mayfsbe' morewadaptablef' How i: ever, in both cases the full .blowing capacit-yisl. utilized: :sofas :to: produce:.aadequatezipressure to'.

withdrawthe'-fumes;.;.

YIn?someainstancesnthe eflywheel casings; dono havef..-removab1e2covers. t:.Inffsuch.;installations fi is apparent.thatatheair zoutletstZ andi: holes-:ajl-:Sbno' .shown as out from the cover in Figiswilltbeieutof intothe'bottom.ofzthecasingn 1. .A crankfcasetscavenger forfan internal come-ef. bustionengine e-provided withia' -breatheresysteml ffor.1th-.-"crank:case-fandehaving a---ywheel w-it teetht one itsperiphery,= comprising-Lan -.airJ sooope attachment A"adapted-#to bewpositioned adjacent-G1 thel'teeth-.iof the# iiywheel-efor receiving: thefljaire moved: by Jsaid#teethg'f-a `:Venturi-attachment` adapted t:to: be connected with theeoutlet@portion y of `the breatherisystems-anda conduit-f'c'onnecting`z saidsair scoop-attachment:with*saidventuriratdf tachment whereby"A the* airlmoved by 'the teeth-of the* iiywheel; will be-fi directedpast Lthe'ffou tlet of the breatherfsystemfto withdraw f-umesiromthere.V

crankease.w Y

2. `Aicranleease@scavenger for an internal com-2.- bustionfJ-engine A provided-withfa fbreatheri systemL teeth n-iits periphery-and a: cover zthereforgtzcome-e.. prisinga an Lair scoop-.attachmentwa Venturi at-f. tachment'a conduit iconnectingifthe `ilr-iletiofth venturi with the breather outlet, an air outlet isaid flywhe'el'eoveri adjacentithecteeth of the' "wheel, saidf.airiscooncompnisinga plateriorme foi'atta'ehment zto'said fcover' lover:said.lairfoutlet an airoutlet'adapted-.to be falign'edr with@theeoveirS air outlet whenthe plate is attached, a condui loadings.'- from thewair `ccmtle'tueot'.saidipiataV anda imeansaoonnecting s'aidficonduitrwithfsaidVenturi i I 5 attachment whereby air moved by the teeth of the ywheel is directed through the venturi to eiect a rapid Withdrawal of air from the crank case.

bustion engine provided with a crank case and having a yWheel with teeth on its periphery, comprising an air scoop attachment adapted to be positioned adjacent the teeth of the flywheel 3. A crank case scavenger for an internal com-` for receiving the air moved by said teeth, a Venturi attachment adapted to be connected with the interior of the crank case and a conduit connecting said air scoop attachment with said Venturi attachment whereby the air moved by the teeth of the ywheel will be directed through the ventur to Withdraw fumes from the crank case.

CLARK C. RANDALL. 

